<?php
namespace Addons\Inqunbao;

use Services\Service;

class Helper extends Service
{
    //获取域名
	public function get_http_server_name(){
		$http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';
		return  $http_type.$_SERVER['HTTP_HOST'];
	}
	
	/**
	 * 生成宣传海报
	 * @param array  参数,包括图片和文字
	 * @param string  $filename 生成海报文件名,不传此参数则不生成文件,直接输出图片
	 * @return [type] [description]
	 */
	public function createPoster($config=array(),$filename=""){
	  //如果要看报什么错，可以先注释调这个header
	  if(empty($filename)) header("content-type: image/png");
	  $imageDefault = array(
		'left'=>0,
		'top'=>0,
		'right'=>0,
		'bottom'=>0,
		'width'=>100,
		'height'=>100,
		'opacity'=>100
	  );
	  $textDefault = array(
		'text'=>'',
		'left'=>0,
		'top'=>0,
		'fontSize'=>32,       //字号
		'fontColor'=>'255,255,255', //字体颜色
		'angle'=>0,
	  );
	  $background = $config['background']['background'];//海报最底层得背景
	  //背景方法
	  $backgroundInfo = getimagesize($background);
	  $backgroundFun = 'imagecreatefrom'.image_type_to_extension($backgroundInfo[2], false);
	  $background = $backgroundFun($background);
	  $backgroundWidth = $config['background']['width']?$config['background']['width']:imagesx($background);  //背景宽度
	  $backgroundHeight = $config['background']['height']?$config['background']['height']:imagesy($background);  //背景高度
	  $imageRes = imageCreatetruecolor($backgroundWidth,$backgroundHeight);
	  $color = imagecolorallocate($imageRes, 0, 0, 0);
	  imagefill($imageRes, 0, 0, $color);
	  // imageColorTransparent($imageRes, $color);  //颜色透明
	  imagecopyresampled($imageRes,$background,0,0,0,0,$backgroundWidth,$backgroundHeight,imagesx($background),imagesy($background));
	  //处理了图片
	  if(!empty($config['image'])){
		foreach ($config['image'] as $key => $val) {
		  $val = array_merge($imageDefault,$val);
		  $info = getimagesize($val['url']);
		  $function = 'imagecreatefrom'.image_type_to_extension($info[2], false);
		  if($val['stream']){   //如果传的是字符串图像流
			$info = getimagesizefromstring($val['url']);
			$function = 'imagecreatefromstring';
		  }
		  $res = $function($val['url']);
		  $resWidth = $info[0];
		  $resHeight = $info[1];
		  //建立画板 ，缩放图片至指定尺寸
		  $canvas=imagecreatetruecolor($val['width'], $val['height']);
		  imagefill($canvas, 0, 0, $color);
		  //关键函数，参数（目标资源，源，目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h）
		  imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'],$resWidth,$resHeight);
		  $val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']) - $val['width']:$val['left'];
		  $val['top'] = $val['top']<0?$backgroundHeight- abs($val['top']) - $val['height']:$val['top'];
		  //放置图像
		  imagecopymerge($imageRes,$canvas, $val['left'],$val['top'],$val['right'],$val['bottom'],$val['width'],$val['height'],$val['opacity']);//左，上，右，下，宽度，高度，透明度
		}
	  }
	  //处理文字
	  if(!empty($config['text'])){
		foreach ($config['text'] as $key => $val) {
		  $val = array_merge($textDefault,$val);
		  list($R,$G,$B) = explode(',', $val['fontColor']);
		  $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
		  $val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']):$val['left'];
		  $val['top'] = $val['top']<0?$backgroundHeight- abs($val['top']):$val['top'];
		  imagettftext($imageRes,$val['fontSize'],$val['angle'],$val['left'],$val['top'],$fontColor,$val['fontPath'],$val['text']);
		}
	  }
	  //生成图片
	  if(!empty($filename)){
		$res = imagejpeg ($imageRes,$filename,90); //保存到本地
		imagedestroy($imageRes);
		if(!$res) return false;
		return $filename;
	  }else{
		imagejpeg ($imageRes);     //在浏览器上显示
		imagedestroy($imageRes);
	  }
	}

}
